Contradiction with Exodus 2:10
Acts 7:21 states Moses was "cast out" and adopted by Pharaoh's daughter, while Exodus 2:10 does not mention him being cast out but rather emphasizes Pharaoh's daughter's actions in naming and raising him.
Exodus 2:10: And the child grew, and she brought him unto Pharaoh's daughter, and he became her son. And she called his name Moses: and she said, Because I drew him out of the water. [Moses: that is, Drawn out]
Contradiction with Hebrews 11:24
Acts 7:21 suggests that Moses was taken in as a son by Pharaoh's daughter, but Hebrews 11:24 implies that Moses refused the identity of being the son of Pharaoh's daughter, choosing instead his Hebrew identity.
Hebrews 11:24: By faith Moses, when he was come to years, refused to be called the son of Pharaoh's daughter;
Contradiction with Exodus 2:3-4
Acts 7:21 implies an immediate adoption by Pharaoh's daughter, whereas Exodus 2:3-4 describes how Moses was placed in a basket and left in the river, watched by his sister before Pharaoh's daughter found him.
Exodus 2:3-4: And when she could not longer hide him, she took for him an ark of bulrushes, and daubed it with slime and with pitch, and put the child therein; and she laid [it] in the flags by the river's brink.
Paradox #1
The contradiction could be that Stephen's speech in Acts 7:21 suggests a slightly different account of Moses's early life compared to the Old Testament narrative in Exodus. In Exodus, it is explicitly stated that Moses's sister watched over him and that Pharaoh's daughter found him and arranged for his mother to nurse him. In contrast, Acts 7:21 may be seen as giving a more summarized or different version of these events, leading some to perceive a potential inconsistency in details between the accounts.